From: mitty <mitty@7d2118f6-f56c-43e7-95a2-4bb3031d96e7>
Date: Sun, 12 Dec 2010 13:47:56 +0000 (+0000)
Subject:  * text log for http://ustre.am/mjex (http://www.ustream.tv/channel/magorokutv#utm_ca... 
X-Git-Tag: r89-trunk~6
X-Git-Url: http://lab.mitty.jp/git/?a=commitdiff_plain;h=5262908fc2b7fe1fa6238f616626d8980ca895a1;p=lab.git

 * text log for ustre.am/mjex (http://ustream.tv/channel/magorokutv#utm_campaign=unknown&utm_source=5317153&utm_medium=social) at 22:00 - 22:45 JST

git-svn-id: https://lab.mitty.jp/svn/lab/trunk@84 7d2118f6-f56c-43e7-95a2-4bb3031d96e7
---

diff --git a/commentary/debhw/20101212.txt b/commentary/debhw/20101212.txt
new file mode 100644
index 0000000..933d88f
--- /dev/null
+++ b/commentary/debhw/20101212.txt
@@ -0,0 +1,102 @@
+ƒƒ‚ƒŠ‚̓oƒCƒg’PˆÊ
+ƒfƒBƒXƒN‚̓uƒƒbƒN’PˆÊ
+	—ðŽj“IŒoˆÜ‚Å512byte’PˆÊ
+ƒtƒ@ƒCƒ‹ƒVƒXƒeƒ€‚Í‚±‚̃uƒƒbƒN‚ÌŽg‚¢•û‚ðŒˆ‚ß‚Ü‚µ‚傤A‚Æ‚¢‚¤ƒ‹[ƒ‹
+
+
+‘åÌ‚́A‚ǂ́uƒuƒƒbƒNv‚ðŽg‚¤‚©‚𕨗“I‚ȃƒ‚’ ‚Æ‚©‚ɁuAddressv‚ð‘‚¢‚Ä‚â‚è‚­‚肵‚½
+	No.0 block‚ÍA‚³‚ñA1‚ÍB‚³‚ñA‚Æ‚¢‚¤‚悤‚ɁB
+	telƒRƒ}ƒ“ƒh(?)
+	
+E‚Ç‚±‚ðŽg‚Á‚Ä‚¢‚é‚©
+	•¡”‚̃uƒƒbƒN‚̏ꍇ‚àA’Pˆê‚̃uƒƒbƒN‚ōςޏꍇ‚à‚ ‚é
+	Unix‚ō̗p‚³‚ꂽAƒuƒƒbƒN‚ªŽ©“®‚ÅŠg’£‚³‚ê‚é‚Æ‚¢‚¤‹@”\‚ÍŒ‹‹Ç”á”»‚³‚ê‚È‚ª‚ç‚àL‚Ü‚Á‚Ä‚¢‚Á‚½
+E’N‚ªŽg‚¤‚©
+	inode
+	http://www.tamacom.com/tour/kernel/unix/S/61.html
+	32s–Ú
+		i_mode
+			ƒtƒ@ƒCƒ‹‚̃‚[ƒh
+			short‚È‚Ì‚Å16bit
+			rwx‚Å3bit * 3 = 9bit
+	63s–ځ`
+		‰B‚ꂽƒ‚[ƒh (i_mode)
+		`67s–Ú
+		D => directory
+		R => regular file
+	“à—e‚ªƒ†[ƒU‚ÉŠJ•ú‚³‚ê‚Ä‚¢‚é‚Ì‚ªregular file
+	directory‚ÍOS‚ªŽg—p‚·‚é‚̂ŁAƒ†[ƒU‚Í•’ʈӎ¯‚µ‚È‚¢
+
+¡“ú‚Íinode‚µ‚©‚µ‚È‚¢‚æ
+
+“`““I‚È*nix‚̃tƒ@ƒCƒ‹ƒVƒXƒeƒ€
+
+ƒfƒBƒXƒN“à‚̏‡”Ô
+	æ“ª superblock => ŽŸ‰ñˆÈ~
+	inodeƒGƒŠƒA
+	ˆê”ʃuƒƒbƒN
+superblock
+	‘S‘̂̏î•ñ
+	‰Šú‰»‚·‚é‚Ì‚Ímkfs“™‚̃c[ƒ‹
+inodeƒGƒŠƒA
+	inode‚ªŒÅ‚Ü‚è‚Å‚¬‚Á‚µ‚è“ü‚Á‚Ä‚¢‚é
+	inode‚Ì”z—ñ
+ˆê”ʃuƒƒbƒN
+	directory‚âregular file‚Å–„‚Ü‚Á‚Ä‚¢‚é
+
+mkfs‚µ‚½‚¾‚¯‚ł̓tƒ@ƒCƒ‹ƒVƒXƒeƒ€‚Æ‚µ‚Ä”FŽ¯‚³‚ê‚È‚¢
+ƒtƒ@ƒCƒ‹ƒVƒXƒeƒ€‚Æ‚µ‚āAmkfs‚µ‚½ƒfƒBƒXƒN‚ðOS‚É”FŽ¯‚³‚¹‚é‚Ì‚ÍmountƒRƒ}ƒ“ƒh
+
+mountƒRƒ}ƒ“ƒh‚ª‰½‚ð‚·‚é‚©
+	superblock‚ð“Ç‚ñ‚ŁA³‚µ‚¢FS‚©A’v–½“I‚È•s®‡‚ª‚È‚¢‚©
+	mount /dev/blockdev mountpoint
+		inode‚Ì2”Ô‚ð“Ç‚ñ‚ŁAmountpoint‚É’Ç‹L
+		2”Ô‚È‚Ì‚ÍŒˆ‚Ü‚Á‚Ä‚¢‚é
+		inode‚Ì2”Ô‚Í”ñí‚ɏd—v
+	umount
+		ƒtƒ@ƒCƒ‹‚ª‘S‚ĕ‚¶‚Ä‚¢‚é‚©
+			inode‚ª‘S‚Älock‚³‚ê‚Ä‚¢‚È‚¢
+inode‚Ì2”Ô
+	ŠeFS‚Ì2”Ôinode‚̓fƒBƒŒƒNƒgƒŠ\‘¢‚Ìroot‚Æ‚È‚Á‚Ä‚¢‚é
+	mkfsƒRƒ}ƒ“ƒh‚ÌFS‚̏‰Šú‰»’¼Œã‚́AmkfsƒRƒ}ƒ“ƒh‚ª2”Ô‚ðƒfƒBƒŒƒNƒgƒŠ‚É•K‚¸ƒZƒbƒg‚·‚é
+
+inodeˆêŒÂ‚ªˆê‚‚̃tƒ@ƒCƒ‹
+
+inode‚Ì”z—ñ‚©‚çA–¢Žg—p‚Ìinode‚ð’T‚µ‚Ä‚«‚āAƒƒ‚ƒŠã‚ɓǂݍž‚݁Aregular <= +1‚µ‚Ädisk‚ɏ‘‚«–ß‚·
+	–¢Žg—p‚ð’T‚·ƒAƒ‹ƒSƒŠƒYƒ€‚Í•Ê‚É‚ ‚é
+ˆê”ʃuƒƒbƒN‚̋󂫗̈æ‚ð’T‚·
+	’T‚·ƒAƒ‹ƒSƒŠƒYƒ€‚ª•Ê‚É‚ ‚é
+	39s–Ú‚ÌNADDR‚ª–¢Žg—p
+
+*nix‚Å‚ÍinodeŽ©‘Ì‚ªƒtƒ@ƒCƒ‹
+	uƒtƒ@ƒCƒ‹ = inodev
+	inode‚ÍŽ¯•ÊŽq‚Å‚Í‚È‚¢‚̂ŁA”ԍ†‚ª‚‚¢‚Ä‚¢‚é
+		ui_nov
+		uls -iv‚Åinode”ԍ†‚ªo‚é
+	"ls -i /"
+		=> 2
+lnƒRƒ}ƒ“ƒh‚Åhardlink‚ðì‚é
+	ƒtƒ@ƒCƒ‹‚ðinode‚̔ԍ†‚ŌĂԂ͖̂ʓ|‚Ȃ̂ŁA–¼‘O‚ð‚‚¯‚é
+	ƒtƒ@ƒCƒ‹–¼‚Í•¡”‚‚¯‚ç‚ê‚é
+Á‚¦‚éƒ^ƒCƒ~ƒ“ƒO‚ÍrmƒRƒ}ƒ“ƒh‚ð‘Å‚Á‚½uŠÔ‚Æ‚ÍŒÀ‚ç‚È‚¢
+
+uino <=> file namev‚Ì‘g‚ݍ‡‚킹‚ð”z—ñ‚Æ‚µ‚ÄŽ‚Á‚Ä‚¢‚é“z‚ª‹‚é
+	|ino | file name |
+	| 41 |   file A  |
+	| 41 |   file B  |
+	‚̂悤‚ÈŠÇ—•ë“I‚È•¨
+	ŽÀ‚Í‚±‚ꂪƒfƒBƒŒƒNƒgƒŠƒtƒ@ƒCƒ‹
+		ƒfƒBƒŒƒNƒgƒŠƒtƒ@ƒCƒ‹‚ð–³—–Œ©‚é‚ÆŒ©‚¦‚é
+		"cat ."
+			Linux‚͍\‘¢‚ªˆá‚¤‚Ì‚ÅŒ©‚ê‚È‚¢
+	¡‚ÌLinux‚ÆV7‚̃tƒ@ƒCƒ‹ƒVƒXƒeƒ€‚̍\‘¢‚Í“¯‚¶
+		ƒtƒ@ƒCƒ‹ƒVƒXƒeƒ€‚ÌŠî–{“I‚ȃfƒUƒCƒ“\‘¢‚Í“¯‚¶
+		‚à‚¿‚ë‚ñŽÀ‘•ã‚̍H•vEi‰»‚Í‚ ‚é
+		ƒAƒ“ƒeƒB[ƒN‚ÈUnix‚ð¡‰ñŽæ‚èã‚°‚½——R‚Í‚±‚ê
+
+tempƒtƒ@ƒCƒ‹
+	ƒtƒ@ƒCƒ‹‚ðì‚Á‚½uŠÔ‚Éunlink => ƒvƒƒZƒX‚ªŽ–ŒÌŽ€‚µ‚Ä‚àŸŽè‚Ƀtƒ@ƒCƒ‹‚ªÁ‚¦‚é
+
+Ì‚̓fƒBƒXƒN‚ª‚‰¿‚Å‘å‚«‚È’PˆêƒfƒBƒXƒN‚ð—pˆÓ‚·‚é‚Ì‚ª“‚©‚Á‚½‚̂ŁA
+¬‚³‚ȃfƒBƒXƒN‚ðÚ‚¬–Ø‚µ‚āA‘å‚«‚­Œ©‚¹‚é‚Æ‚¢‚¤‹ê“÷‚̍ô
+	=> inode 2